Web Push Notifications work on both desktops and mobile devices. You may not find the opt-in prompt if you have already subscribed/blocked the prompt or if you are browsing on an unsupported device or browser.
Apple hasn't yet launched web push notifications on iOS devices. The recent release of IOS 16.4 Beta 1 includes support for this feature on iPhones and iPads.
Despite being in beta, PushOwl will be prepared for when Apple makes the feature available to the public.
Since Apple doesn't support web push notifications on IOS right now (iPhones, iPad), we do not show price drop and back in stock widget as well.